Control or power lever mechanism



. A. J. M EWAN CONTROL OR POWER LEVER MECHANISM Nov. 4, 1930;

2 sheets-sheet 1 Filed Sept. 50, 1926 Nov. 4, 1930. A. J. M EWAN 1,780,713

CONTROL OR POWER LEVER MECHANISM Filed Sept. 30, 1926 2 Sheets-Sheet 2 331d rewll lcgvva 77 enema Nov. 4, 1930 V 1,780,713

' Aivimnw nivrnwnivi earnest comm; amma eaves iii i iorrhnrsiir This-invention relates to controlor power on line '1 onaang'enlarged lever mechanisms wherein a pivoted 'lever is scal'ei q if a A v r V employed for transmltting variable power 7 Figure 4. is a vertical-longitudinal sec or varlably' controllingor governing applied tlonfthrough theshifting fulcruinper soon powers through a .shifting of the fulcrum aflargerrscale than that shown in Figure};

point ofuanu intermediately pivoted lever to In the *constructionah example shown, change the relativepower ratios of its op- Wherein IhaVe'shownthe fulcrum employed positelyextending ends or arms. in connection witlrth'e valve controlled or One object of the invention is to prooperating-lever for theval've membehof 'a vide a lever mechanism with. a shifting fulfluid pressure-regulati-ng'valve,:1 designates e0 crum of novel construction, whereby the a'valveca'sing having ports 2 and 3,"and a lever is pivotally supported for a free and valve controlling -communicationxbetween easy pivotal movement whilepermitting of said ports, said valve having its stem 5' pro the shifting of the fulcrum to different p'o jeotingfu-pwardly into a valve-lever casing 6.

7 sitions longitudinally of the lever. 1 i and into a =bonnet -7 connected therewith. es

' Another objecto'f the invention is to pro- Aspring '8 isprovided which isenclosed inta vide a lever mechanism which isenclosed guide 'cageorcylinder 9: carried by the stem and protected frolninjury and in Whicha and' is'adapted 'to'bear-up'onthe fianzge'or shifting of the fulcrum may be readily and hea'd lt) ofa stem ll, said stem and head conveniently efi'ected' from the exterior of forming a stationary' abutment and tension a the enclosure c p c in'gdevic'efor the spring. The spring may Still another object of theinvention is to be di'sposed' between the abutment 10 and provide a shiftable fulcrum whichgmay be lower end of the-cage 9 "for a valve closing arranged so as to be guided inan enclosure action o'rit maybe disposed between thetop 1 and which is of open construction so asto of the'cage and the abutment 10 for a valve 75' permit flow of fluidsor liquids through the openinga'ction, r fulcrumfrom side to side thereof, l In the casing 6'is disposedacontrol lever 12 Still another object of the invention is to pivotally connectedat its inner end, asat 13, provide a roller bearing shifting fulcrum to the valve stems5. The opposite orouter which allows free sliding and pivotal move end of th'e lever 12 is pivotally conncte d, 80 ments of the lever to adapt the lever to swing as at 14,-to the stem 15- of a weighted flexible freely in its controlling or power trans: diaphragrnlfi in a' diaphragm chamber 17; m itting movements while also adapting the I At one side the diaphragm chamber is prolevcr to shift longitudinally to compensate vided with an opening-bounded byaflange 18 for angularitiesof movements betweenits whichis'ada'pted forthr'eaded engagement 85 v arms and parts operatively coupledrthereto. with an opening 19 inthe bottom of the While the invention is adapted for general casing 6, as shown, or with an opening 20 in use in mechanisms of various kinds employ: the top of the casing. The diaphragm is ing a lever Whose powers are to be varied, thus. coupled to the lever so as to be in- 40 I have in the accompanying drawing, for fiuenced by fluid-pressure under certain con- 90 purpose of exemplification, shown its; apditions, for opposing a working force on the plication to a fluid pressure regulator, in lever 'in opposition to the force of the spring. which drawing, When the spring 8is arranged as shownin Figure '1 is a vertical longitudinal section Figure 1 for a' valve closingaction, the diathrough a fluid pressureregulatingfvalve5 phra-g'm 'chamloerf ll' is. connected withopenas showing the embodiment of, theinvention ing-19so th'at the diaphragm 16, under-the therein. 1 I I: V for'cei'of fluid pressure acting uponits upper Figure 2 is a section on line 2- 2 of Figure face 'will' transmit'opening: movement tothe 1 one reduced scale. valved against'the pressure of the spring 8.

Figure 3 is a vertical transverse section When thespring 8 is disposed between the a a valve liftin vided for closing either opening 1901' 20 when the diaphragm chamber is disconnected therefrom.

' of supplemental guiding, means.

The lever 12 is pivotally su ported intermediate of its ends by a shi ting fulcrum' embodying myiinvention. This shifting fulcrum comprises a fulcrum block or frame consisting of side plates 22 suitably connected at their upper ends and held in spaced "relation by a bolt or rivet23 and suitably connected and held in'spaced relation at their lower endsby abottom plate 24secured to the side plates by screws or other suitable .fa'st'enings 25. The plug or frame, as shown,

is 50f rectangular formation .to conform to that of the casing 6,.and-is fitted for an accurate: guide motion therein without the use Disposed between the two side plates '22 is a bearing roller 26having an'opening .27 through which the lever. -12 extends andr through' which; the lever is slidably movable to compensate for variations in angularities of motion between its-ends andthe valve stem 5 and diaphragm stem 15 coupledthereto. This roller is'providedat its ends with trunnions28 journaled in anti-friction rolleror. ball bearings29 set in recesses, 30 in the .side plates 22, thus adapting the roller and lever to have free and easy pivotal movements. The roller 26 is disposed between the parts 23 and 24 and is spaced therefrom so as to allow the lever 12 to have proper swing without interference, and so as toprovide an open fram'efulcrum which will permit of the free flow of fluid under pressure throughout the casing 6.

: By-adjustment of the shifting fulcrum in I the casing ,6 it will be understood that the length of the lever arms projecting beyond oppositesi'des of the. fulcrum and coupled to the valveand diaphragm, respectively, may be varied so as to'var'y their power ratios, thus providing-for such a change in ratios, in connection with variations in the tension of spring 8,'as maybe-necessary to secure a desired sensitiven'es's of valve action, 'or a determined va-lve action under different pressures- The lever and-its fulcrum are enclosed withinTthecasin-g 6 and thus protected from access of dust and dirtand liabilityof casual-demngementlfor injury. Suitable means may lie-provided for adjustingth'e shifting fulcr um from the exterior of the casing. In the present :i-nstan'ce rods 31 and 32 are shown which are connected at their inner ends with i,7so,7 1 3 and operation ofmy improved power or control mechanism will be readily understood and it will be seen that my invention provides a power or control leverand novelshifting fulcrum therefor whereby the power ratios of the lever arms may be varied within wide limits. Also it will be seen that the construction described provides for the enclosure and protection of the parts against injury and the adjustment of the fulcrum as required from the exterior of the casing without the necessity of removing any parts. TVhile my in vention is shownan'd described as applied to a fluid pressure regulator, it is, of course, adapted for many and varied purposes, wherever a power or control action is desired. I thereforedo not limit the invention in its application to any particular organization, ex cept when so restricted by the appended claims. V

Having'thus fully described my invention, 1 claim j v 1. In a power mechanism, a casing of restricted cross-sectional dimensions, fulcrum block of the same cross-sectional shape as the casing and slidably engaging the walis thereof, a roller carried by said fulcrum block, a lever pivotally mounted by said roller on the block and shiftable longitudinally through the block, counteracting force applying devices acting upon the opposite ends of the lever, and means connected with the block and eXtendingto the exterior of the casing whereby the block may be adjusted to vary the fulcrum point of the lever and the force applying ratios of the force applying devices acting on the ends thereof.

2. In a power mechanism, a casing of restricted cross-sectional dimensions, a fulcrum block disposed within and in positive guided connection with the casing, a roller carried by said fulcrum block, a lever pivotally mounted by saidroller on theblock and shiftable longitudinally through the block, counteracting force applying devices actin upon the opposite ends of the lever, and means connected with the block and extending to the exterior of the casing whereby said block may be slidably shifted in the casing.

In testimony whereof I afliX my signature.

ANDREVI J. h foEVVAN. 

